<!DOCTYPE html>
<html>
  <head>
    <style>
      div {
        outline-width: 10px; outline-style: solid;
        width: 400px; height: 50px;
        margin: 20px 0;
        border-style: solid; border-color: transparent; border-width: 0;
        padding: 0;
      }
    </style>
  </head>
  <body>
    <div style="-moz-outline-radius: 20px / 2.5px;"></div>
    <div style="-moz-outline-radius: 40px / 5px;"></div>
    <div style="-moz-outline-radius: 80px / 10px;"></div>
    <div style="padding: 0 100px; -moz-outline-radius: 60px / 5px;"></div>
    <div style="padding: 0 100px 0 0; -moz-outline-radius: 50px / 5px;"></div>
    <div style="padding: 0 0 0 100px; -moz-outline-radius: 50px / 5px;"></div>
    <div style="border-width: 0 100px; -moz-outline-radius: 60px / 5px;"></div>
    <div style="border-width: 0 100px 0 0; -moz-outline-radius: 50px / 5px;"></div>
    <div style="border-width: 0 0 0 100px; -moz-outline-radius: 50px / 5px;"></div>
    <div style="border-width: 0 100px; padding: 0 100px;
                -moz-outline-radius: 80px / 5px;"></div>
  </body>
</html>
